core: Support Windows absolute paths for UDS proxy upstreams (#5114)

* added some tests for parseUpstreamDialAddress

Test 4 fails because it produces "[[::1]]:80" instead of "[::1]:80"

* support absolute windows path in unix reverse proxy address

* make IsUnixNetwork public, support +h2c and reuse it
* add new tests

1 files changed, 7 insertions, 6 deletions

diff --git a/listeners.go b/listeners.go
index 5bf85a0..f922144 100644
--- a/listeners.go
+++ b/listeners.go
@@ -205,7 +205,7 @@ func (na NetworkAddress) listen(ctx context.Context, portOffset uint, config net
 // IsUnixNetwork returns true if na.Network is
 // unix, unixgram, or unixpacket.
 func (na NetworkAddress) IsUnixNetwork() bool {
-	return isUnixNetwork(na.Network)
+	return IsUnixNetwork(na.Network)
 }
 
 // JoinHostPort is like net.JoinHostPort, but where the port
@@ -289,8 +289,9 @@ func (na NetworkAddress) String() string {
 	return JoinNetworkAddress(na.Network, na.Host, na.port())
 }
 
-func isUnixNetwork(netw string) bool {
-	return netw == "unix" || netw == "unixgram" || netw == "unixpacket"
+// IsUnixNetwork returns true if the netw is a unix network.
+func IsUnixNetwork(netw string) bool {
+	return strings.HasPrefix(netw, "unix")
 }
 
 // ParseNetworkAddress parses addr into its individual
@@ -310,7 +311,7 @@ func ParseNetworkAddress(addr string) (NetworkAddress, error) {
 	if network == "" {
 		network = "tcp"
 	}
-	if isUnixNetwork(network) {
+	if IsUnixNetwork(network) {
 		return NetworkAddress{
 			Network: network,
 			Host:    host,
@@ -353,7 +354,7 @@ func SplitNetworkAddress(a string) (network, host, port string, err error) {
 		network = strings.ToLower(strings.TrimSpace(beforeSlash))
 		a = afterSlash
 	}
-	if isUnixNetwork(network) {
+	if IsUnixNetwork(network) {
 		host = a
 		return
 	}
@@ -384,7 +385,7 @@ func JoinNetworkAddress(network, host, port string) string {
 	if network != "" {
 		a = network + "/"
 	}
-	if (host != "" && port == "") || isUnixNetwork(network) {
+	if (host != "" && port == "") || IsUnixNetwork(network) {
 		a += host
 	} else if port != "" {
 		a += net.JoinHostPort(host, port)